Form: This specification covers one type of organic (para-aramid) fiber in the form of yarn. The product shall be formed as a multiplicity of filaments drawn together and gathered into an approximately parallel arrangement. Classification: Organic fiber 400 denier (440 dtex) yarn with 23.7 gpd (209.2 cN/tex) nominal tensile strength and 670 gpd (5915 cN/tex) nominal tensile modulus for use in cables and cordage requiring high tensile strength and moderate modulus of elasticity in tension.